Listing all of the characters that are Mimic-ready would take some time, so I'll just mention a few that didn't start out that way ....

I've personally created Mimic updates for:

WarriorDL's Yoda figure
Valandar's Land Dragon
Talon69's Mike the TV
the Poser wolf
DAZ's House Mouse (no easy task, as it didn't originally have a mouth)

And Furrette has been Mimic-ready from her inception.

I've made other figures Mimic-ready for my own amusement (Lemurtek's Lionheart, DAZ's Toonimal Puppy, etc.), but haven't released them.

In Free Stuff, you can find an update for Lemurtek's Tobi, courtesy of Redfern. The morph targets should work with the Poser cat, along with Lemurtek's Thomas, Guenevere, Arthur, Jezebel, and Ahab, should you wish to transfer them via Morph Manager.

JFStan also has updates for the raptor and dog in Free Stuff.